(Photo by Amanda Edwards/Getty Images)LOS ANGELES, CA - SEPTEMBER 10: Julianne Hough and Derek Hough arrives at the 6th Annual Celebration Of Dance Gala Presented By The Dizzy Feet Foundation at The Novo by Microsoft on September 10, 2016 in Los Angeles, California.(Photo by Steve Granitz/Wire Image)BEVERLY HILLS, CA - AUGUST 02: Derek Hough arrives at the 2016 Summer TCA Tour - NBCUniversal Press Tour Day 1 at The Beverly Hilton Hotel on August 2, 2016 in Beverly Hills, California.(Photo by Michael Tullberg/Getty Images)PORTER, IN - SEPTEMBER 26: Derek Hough partners with The National Park Foundation to explore Indiana Dunes National Lakeshore on September 26, 2017 in Porter, Indiana.(Photo by Daniel Boczarski/Getty Images for National Park Foundation)WEST HOLLYWOOD, CA - SEPTEMBER 19: Jenna Dewan Tatum and Derek Hough attend NBC's 'World of Dance' celebration at Delilah on September 19, 2017 in West Hollywood, California.' at Saban Media Center on February 16, 2017 in North Hollywood, California.
(Photo by C Flanigan/Film Magic)NEW YORK, NY - FEBRUARY 11: Professional Dancer Derek Hough attends Nylon and Fashion Police's 'Fifty Shades Of Grey' Release Party at Dream Downtown on February 11, 2015 in New York City.With Julianne Hough's upcoming wedding fast approaching, the star's older brother and touring dance partner, Derek Hough, says he's getting prepared for his sister's big day."I'm excited!My baby sister [is] getting married [and] it's gonna be special to have the whole family there. " Derek shared with ET's Lauren Zima at the Los Angeles debut of Travis Wall and Shaping Sound's new show, After the Curtain, at Royce Hall at UCLA on Tuesday."It's gonna be like, a week-long event," he added.But according to Derek, it's not going to cause too much conflict."We have different friends [and] different groups," he explained.PHOTOS: Julianne Hough and her future husband together LOS ANGELES, CA - SEPTEMBER 12: Brooks Laich and Julianne Hough attend the 2015 Creative Arts Emmy Awards at Microsoft Theater on September 12, 2015 in Los Angeles, California.(Photo by Jason La Veris/Film Magic)BEVERLY HILLS, CA - AUGUST 30: Julianne Hough, engagement ring detail, attends the Television Academy's cocktail reception for the 67th Emmy Award nominees for Outstanding Choreography at Montage Beverly Hills on August 30, 2015 in Beverly Hills, California.